<!DOCTYPE html>
<html>
<head>
	<meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> 
	<title>测试文档无标题</title>
	<style type="text/css">
	* {
		padding: 0;
		margin: 0;
	}
    </style>
</head>
<body>
	<h1>Hello</h1>
	<script src="https://cdn.staticfile.org/jquery/3.5.1/jquery.js"></script>
	<script type="text/javascript">
	"use strict"
	var arr = [1, 3, 6];
	var b = arr ;

	b[1] += 10
	b[arr.length] = 'Hello' 

	console.log(arr) ;
	console.log(b) ;
	
	</script>
</body>
</html>